tree b5b11218dd23b61e4b26e04823cf624c716c0409
parent 35cc03f97d7d957bfecd540549a2d0cc809c8684
author Jacob Erlbeck <jerlbeck@sysmocom.de> 1403885453 +0200
committer Holger Hans Peter Freyther <holger@moiji-mobile.com> 1406041917 +0200

gprs: Parse PTMSI and update TLLI accordingly

This commit adds code to parse the PTMSI in network originated
messages

  - Attach Accept,
  - Routing Area Update Accept, and
  - P-TMSI Reallocation Command (see below)

to keep track of the TLLI identifying the LLC connection.

The P_TMSI Realloc Command specific code is not being tested yet, so
a corresponding notice is logged when such a message will be
received.

NOTE:
  The gbproxy will lose the TLLI when the MS doesn't receive/use
  the message (normally the SGSN remembers the old TLLI for some time
  to avoid this kind of problem). If this happens the MS will
  probably restart the procedure and the network will have to answer
  again eventually using one of the above messages which will
  re-associate the IMSI with the TLLI before the MS can send a
  PDP Context Request message.

Ticket: OW#1192
Sponsored-by: On-Waves ehf